Shortest way to check if a variable contains positive integer using PHP?

Question

I want to check if user input a positive integer number.

1    = true
+10  = true
.1   = false
-1   = false
10.5 = false


Just a positive number. 
No charact         


        

Answer 1

Try the native Filter function*

filter_var($value, FILTER_VALIDATE_INT, array(
    'options' => array('min_range' => 1)
));

^{* if you just want to make sure the input string consists of an arbitrary length digit sequence, use a regex with [0-9] or [\d+]}

Examples with filter_var:

var_dump( filter_var(1, FILTER_VALIDATE_INT) ); // int(1)

var_dump( filter_var('1', FILTER_VALIDATE_INT) ); // int(1)

var_dump( filter_var('+10', FILTER_VALIDATE_INT) ); // int(10)

var_dump( filter_var(.1, FILTER_VALIDATE_INT) ); // bool(false)

var_dump( filter_var('.1', FILTER_VALIDATE_INT) ); // bool(false)

var_dump( filter_var(-1, FILTER_VALIDATE_INT, 
    array('options' => array('min_range' => 1))) ); // bool(false)

var_dump( filter_var('-1', FILTER_VALIDATE_INT, 
    array('options' => array('min_range' => 1))) ); // bool(false)

var_dump( filter_var('2147483648', FILTER_VALIDATE_INT) ); // bool(false)

var_dump( filter_var('0xFF', FILTER_VALIDATE_INT) ); // bool(false)

var_dump( filter_var(0xFF, FILTER_VALIDATE_INT) ); // int(255)